Sk Innovation Co., Ltd.

Sk Global Chemical Co., Ltd.

Sk Corporation

Sk Energy Co., Ltd.

Sk Holdings Co., Ltd.

Jong Ho Lim

Jin Su Ham

Han Sol Lee

Jong Chan Kim

Hyo Seung Park

Kwang Kuk Lee

Sang Soo Lee

Yu Na Shim

Sang Il Lee

Jin Sung Kim

Tae Wook Kwon

Seong Jun Lee

Nahm Ryune Cho

Jae Suk Koh

Seong Il Lee

Byong Sung Kwak

Je Ho Lee

Jeon Koo Lee

Ki Nam Chung

Soo Young Hwang

Su Jin Lee

Seung Yon Oh

Byoung In Lee

Joon Sik Lee

Jong Keun Kim

Sung Gi Lee

Eun Hee Park

Jun Bae Hong

Seon Yeong Jeon

Chun Young Kim

Jeong Hyun Noh

Dong Seok Jang

Hee Jun Hwang

Provided is a method of preparing poly(alkylene carbonate) using a molecular weight regulator in a process of preparing a copolymer of carbon dioxide/epoxide using a novel complex synthesized from salen-type ligand including a quaternary ammonium salt as a catalyst. According to the present invention, even though the molecular weight regulator is used, an activity of the catalyst may be stably maintained, whereby the low molecular weight of poly(alkylene carbonate) having a desirable level may be effectively provided. In addition, it is expected that since the novel complex as the catalyst of the present invention has a simple structure as compared to the existing copolymerization catalyst, due to the economical preparation cost thereof, the novel complex may be effectively applied to a large-scale commercial process.

Method of preparing poly(alkylene carbonate) via copolymerization of carbon dioxide/epoxide in the presence of novel complex

Provided are an electrolyte for a high-voltage lithium secondary battery and a high-voltage lithium secondary battery containing the same, and more particularly, an electrolyte for a high-voltage lithium secondary battery which may not be oxidized and decomposed at the time of being kept at a high voltage and a high temperature to prevent swelling of a battery through suppression of gas generation, thereby having excellent high-temperature storage characteristics and excellent discharge characteristics at a low temperature while decreasing a thickness increase rate of the battery, and a high-voltage lithium secondary battery containing the same.

Electrolyte for lithium secondary battery and lithium secondary battery comprising same

The present invention is directed to a novel complex synthesized from a Salen-type ligand. The novel complex contains a quaternary ammonium salt. The present invention is also directed to a preparation method of a copolymer of carbon dioxide and epoxide using the complex synthesized from a Salen-type ligand as a catalyst.

Complex and preparation method of poly(alkylene carbonate) using the same

Provided are a plasticizer for a resin composition including any one or more selected from a polyvinyl chloride resin, a polyurethane resin, an epoxy resin, a polycarbonate resin or a biodegradable resin, which has excellent mechanical properties such as tensile strength, elongation and hardness, and shape processability, and particularly has excellent flexibility at low temperatures, does not cause bleeding because compatibility with the resins is good, and has excellent transparency, heat resistance, cold resistance and durability, and a resin composition including the same.

Plasticizers for resin compositions and resin compositions including the same

Provided is a method of identifying authenticity of oil by reacting oil marked by a Oil Marker Composition with a developer to develop a color and then measuring absorbance. According to the present invention, an oil maker capable of quantitatively and qualitatively measuring authenticity of oil due to a rapid reaction rate, excellent reproducibility, and distinct color development that may be observed by the naked eyes, and a method of identifying oil using the same.

Diamine-based oil marker compositions and method of identifying oil product using the same

Disclosed herein is a method of producing an optically active thiophene-based compound using a simulated moving bed adsorption separation process, and more specifically, a method of continuously separating a racemic thiophene-based compound into its optically active thiophene-based compounds having high purity, through optical resolution using the simulated moving bed process. According to the method of the current invention, a racemic mixture of a thiophene-based compound can be continuously separated into its optically active thiophene-based compounds having high purity, which is an intermediate of optically active dorzolamide acting as a topical therapeutic agent for glaucoma, using a simulated moving bed adsorption separation technique, thereby increasing industrial usability.

Method for separating of optically pure thiophene compounds using simulated moving bed chromatography

Disclosed is a method for preparing (S)-indoline-2-carboxylic acid and (S)-indoline-2-carboxylic acid methyl ester using an inexpensive industrially available enzyme capable of assuring superior optical purity and yield. At this time, the hydrolytic enzyme is selected from the group consisting of Savinase, Alcalase, Novozym 243, Everlase, Esperase, Protease 7 and Acylase, whereby (S)-indoline-2-carboxylic acid and methyl ester thereof having an optical purity of at least 99% e.e. can be obtained through a simplified preparation process, thus generating economic benefits.

Method for preparing (s)-indoline-2-carboxylic acid and (s)-indoline-2-carboxylic acid methyl ester using hydrolytic enzyme

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Daejeon, South Korea

Jong Ho Lim